(40,680, ♂, Fort Whipple, Arizona). Bill (from nostril), .30; tarsus, .60; wing, 2.60; tail, 2.20. Superciliary stripe extending .20 behind the eye, that portion behind the eye white; yellow of jugulum not spreading over breast (ending 1.35 from the bill). Streaks of crown coalesced into a broad stripe on each side; those of back broad, and those on upper tail-coverts almost obsolete. Wing-bands, .20 wide. Lore dusky-grayish. _Hab._ Fort Whipple, near Prescott, Arizona; abundant, breeding (COUES) … var. _graciæ_. (41,808, ♂, Belize). Bill, .30; tarsus, .60; wing, 2.20; tail, 1.95. Superciliary stripe scarcely passing the eye, wholly yellow; yellow of jugulum spreading over breast (ending 1.60 from the bill). Streaks of the crown scarcely coalesced along its sides; those on back not longer than those on crown, and those on upper tail-coverts very conspicuous. Wing-bands, .10 wide. Lore deep black. _Hab._ Belize, Honduras, resident? … var. _decora_. HABITS. We are indebted to Dr. Elliott Coues for all that we at present know in reference to this recently discovered species. He first met with it July 2, 1864, in the Territory of Arizona. Dr. Coues first noticed this bird among the pine woods covering the summit of Whipple’s Pass of the Rocky Mountains. He saw no more in his journey into Central Arizona until he was again among the pines at Port Whipple. There he again found it, and it proved to be a very common bird. Dr. Coues anticipates that this species will yet be found to occur in the forests of the San Francisco Mountains, and that its range will be ascertained to include all the pine tracts of New Mexico and Arizona, from the valley of the Rio Grande to that of the Great Colorado River. He also has no doubt that it breeds near and around Fort Whipple. Specimens found at Belize, first believed to be identical with those from Arizona, are now referred to a race called _decora_. According to Dr. Coues’s observations, the Warbler arrives at Fort Whipple about the 20th of April, and remains in that neighborhood until the third week in September. It is found almost exclusively in pine woods, is active, industrious, and noisy, and possesses very marked flycatching habits, flying out from its perch to catch passing insects. It has been, so far, found almost exclusively among the tallest trees.